Security guard-ish or SWAT-ish (well anything with a kevlar helmetish) that has intentionally stiffish animations which makes generic flesh impact noises for pain sounds and also makes beepy noises when it dies.

Some kind of prehistoric hercules like guy

Construction Worker

A hillbilly

A guy who smokes and constantly yells out "smocking kills" as a taunt, or maybe even "it was not i who killed you, but 'twas the smokes!"

Cold war era parody spy (Austin Powers style, kinda like how they did Harry Tipper from Timesplitters)

"Gangter", intentional mispelling of gangster, just a trenchcoat man with two types of hats (Fedora and Akubra) fitting well with both Caleb/Alucard like characters and smooth criminals.

Torgo, complete with warbly voice, big knees, and alternate "Torgo the White" texture. When he walks, he should play the Haunting Torgo Theme.

A multicoloured, flaming chameleon-ferret hybrid called Gavin (he also wears a mankini and sounds like Aleksandr Meerkat and The Incredible Hulk merged into one).

Timaster: a Nostradamus-based character, the Master of Time and Universe, which can be inspired by him and Kyonshi, but a little bit bigger. He could be the final boss of the game, and should be as dangerous as Xaero was in Q3A

A gigantic pacman/smiley.

Mantis with praying taunt.

La chuppa cabra.

Some fat disgusting monster, made of three complete corps reorganized in some grotesque fashion (Hans Bellmer? Warcraft3's abomination?)

The cookie monster.

A swedish meatball, eddy.

A werewolf-like creature.

An human sized eyeball.

A big fat baron bastard in a hovering chair, using his weapon as a turret.

For a complete list of Q3A's characters head here. Note that OA is NOT ABOUT remaking their concepts! Just "ishes" that don't look alike (not just "exactly") but share some common shapes and characteristics.

Quake 1 VORE!

A big juggernaut-ish porportion male like this but much much lower poly.

A fat ogre-like man

OpenQuartz's player.mdl ported and reanimated, with the same old UVs.

A futuristic cowboyish soldier. (Sarge replacement?)

A skeleton outfitted with an old naval uniform who also has a top hat.

A cyborg in a communistish outfit. (ta blitzkrieg-ish)

Cyborg-implant girl (pi-ish)

Grism girl!

Orbbish idea: Monkey/ape/gorilla who runs around on arms twices as long as his body. Holds his gun with his feet.

Maybe a one-eyed pink fish with mechanical feets? (like futurama's).. that could end up in many skins. Concept - looks like Q3A's Orbb (Eye => aquarium :) )

lucy-ish ish character (BBW type figure) only make her look somewhat good looking/sexy

An ability to add custom bodyparts/clothes and other nice little things to make custom models.

Why not a Werewolf?, you know they are hunters, i think is the perfect character.